Process for continuous quenching with stepless adjusting power
The utility model patent relates to a kind of improved induction heat treatment process, particularly a kind ofly can carry out the stepless adjusting power continuous quenching to non-uniform shaft, make it to obtain successive quench-hardened case and hardened depth and diameter and keep a certain proportion of technology with the small power intermediate frequency power supply.
The induction heat treatment process of non-uniform shaft employing at present mainly contains two kinds:
1, adopt annulus longitudinal magnetic field heating inductor continuous quenching.Impose different driving voltages in the different sections of the diameter of axle, induced current is hoop and flows on the surface of axle, at the step place of axle, because the influence of magnetic field skew, especially when cross section difference is big (the diameter difference is greater than the 10-20 millimeter), quench-hardened case is difficult for continuously, during work easily in this cut-out that twists.In addition, also be difficult for keeping hardened depth to become certain ratio with diameter.
2, adopt the heating of rectangle inductor block transverse magnetic field to quench simultaneously.The more powerful intermediate frequency power supply of this arts demand, the technological equipment investment height only is suitable for producing in enormous quantities.(seeing Table one)
Table one
| Name of product |
Intermediate frequency power supply power (kilowatt) |
Heat-up time (second) |
| Back semiaxis (east wind) |
320 |
59 |
| Back semiaxis (liberation) |
312 |
54 |
The task of the utility model patent provides a kind of improved non-uniform shaft induction heat treatment process, can be according to the profile of workpiece, and the size of step-less adjustment power is carried out continuous quenching.Should heat treated requirement to be fit to medium and small factory production non-uniform shaft satisfaction.
The utility model technology is that following mode realizes:
1, the intermediate frequency power supply power stepless setter that design changes with workpiece and induction coil gap length.
This power stepless setter has two adjusting knobs, and one is to select starting voltage (the minimum place in workpiece and induction coil gap voltage), and another selects workpiece and induction coil gap maximum voltage.Control contacting of model by power stepless setter contact with power, (power control model is with the upper and lower motion of lathe slide unit, power stepless setter contact is done left and right to-and-fro movement with the profile of power control model, drives the contact that contacts with sr it in and does left and right to-and-fro movement) step-less adjustment of the whole quenching process power of realization.
2, make corresponding power control model according to all kinds of traitorous over glazes.
3, set up the synchronous Controlling System of workpiece and power control model.
(1), steady arm: make need the harden initial point position unanimity at position of each identical workpiece.
(2), the starting point that contacts with power stepless setter contact on the power control model resets and centering.
4, design circular transverse magnetic field heating inductor.
The induced current that this inductor block is produced on workpiece is the trapezoidal dentation of sealing along journal surface, and induced current flows through vertically at non-uniform shaft step place, thereby quench-hardened case is obtained continuously easily.
Above-mentioned tooling is installed on the common vertical quenching machine, when workpiece and power control model all is in desired location, chooses various parameters, can satisfy the requirement of non-uniform shaft induction heat treatment.This technology unit time internal consumption power less (seeing Table two) is suitable in the non-uniform shaft, small serial production.
Table two
| Induction coil internal diameter (millimeter) |
Diameter of work dimensional change (millimeter) |
The gap of induction coil and workpiece (millimeter) |
Intermediate frequency power supply power (kilowatt) |
| Φ65 |
Φ60-Φ41 |
2.5-12.0 |
30-55 |
Below with reference to accompanying drawing the utility model technology is described in further detail.(this figure architecture schematic diagram)
With reference to illustrating: processed workpiece (3) is fixed on the quenching machine slide unit (5) with top, induction coil (2) links to each other with induction hardening transformer, the steady arm (4) of determining workpiece heating zero position is fixed on the lathe bed (11), and power control model seat (6) is installed in parallel on the machine tool sliding table (5).DC servo motor (7) is fixed on the top of power control model seat (6), drive power control model (9) by sleeve screw mandrel (8) and do upper and lower moving on power control model seat (6), its purpose makes power control model (9) be in desired location.Two pairs of spacings also be housed be 2 millimeters tinsel (13) on power control model (9), in parallel in the other direction between them with lead.Centering contact (12) is installed on the lathe bed (11), and reset contact (14) is installed on the power control model seat (6), and power stepless setter (10) is fixed on the lathe bed, and contact on it and power control model (9) keep in touch.
The work beginning, workpiece (3) rises slowly, when setting position and steady arm (4) on it when contact contacts, send signal, slide unit (5) stop rises, and workpiece enters and is heated zero position, if power control model (9) is in desired location, then the two pairs of gaps are that 2 millimeters tinsel (13) does not contact with reset contact (14) with its corresponding centering contact (12) on it, just can carry out induction heat treatment to workpiece by the parameter of adjusting.If power control model (9) is not in desired location, a slice in the corresponding two metal sheets with it of centering contact (12) is connected, DC servo motor (7) makes power control model (9) left alone without help at desired location to the direction rotation that contact and tinsel are disengaged.
The synchronous Controlling System of this kind workpiece and power control model can solve deep mixed the causing of center hole and bring that initial point position and workpiece are heated the inconsistent problem of initial point position on the power control model.